write-protecting diskettes is necessary so that important information is not accidentally lost. when diskettes are write-protected, you can read information from the diskettes, but you cannot write information to them.
there is a write-protect tab on the 3.5-inch diskette. to locate the write-protect tab, turn the diskette over with the label facing down.
to prevent writing onto a diskette, slide the write-protect tab to open the protect slot, as shown in the illustration.

to allow writing onto a diskette, slide the write-protect tab to cover the protect slot, as shown in the illustration.